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[PATCH] fat: fix adate
During a forensic analysis on the fat file system, I found than the result for the last access date on this file system was different between the stat command and the istat command (package tct-utils). The istat command display a true date (the right windows date) but the stat primitive (so stat, find, ls command) displays a wrong date. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -300,9 +300,9 @@ static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
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inode->i_blksize = sbi->cluster_size;
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inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
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& ~((loff_t)sbi->cluster_size - 1)) >> 9;
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inode->i_mtime.tv_sec = inode->i_atime.tv_sec =
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inode->i_mtime.tv_sec =
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date_dos2unix(le16_to_cpu(de->time), le16_to_cpu(de->date));
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inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = 0;
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inode->i_mtime.tv_nsec = 0;
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if (sbi->options.isvfat) {
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int secs = de->ctime_cs / 100;
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int csecs = de->ctime_cs % 100;
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@ -310,8 +310,11 @@ static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
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date_dos2unix(le16_to_cpu(de->ctime),
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le16_to_cpu(de->cdate)) + secs;
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inode->i_ctime.tv_nsec = csecs * 10000000;
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inode->i_atime.tv_sec =
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date_dos2unix(le16_to_cpu(0), le16_to_cpu(de->adate));
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inode->i_atime.tv_nsec = 0;
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} else
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inode->i_ctime = inode->i_mtime;
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inode->i_ctime = inode->i_atime = inode->i_mtime;
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return 0;
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}
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@ -513,7 +516,9 @@ retry:
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raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16);
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fat_date_unix2dos(inode->i_mtime.tv_sec, &raw_entry->time, &raw_entry->date);
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if (sbi->options.isvfat) {
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__le16 atime;
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fat_date_unix2dos(inode->i_ctime.tv_sec,&raw_entry->ctime,&raw_entry->cdate);
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fat_date_unix2dos(inode->i_atime.tv_sec,&atime,&raw_entry->adate);
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raw_entry->ctime_cs = (inode->i_ctime.tv_sec & 1) * 100 +
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inode->i_ctime.tv_nsec / 10000000;
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}
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